title: Effects of cryopreservation with a newly-developed magnetic field programmed freezer on periodontal ligament cells and pulp tissues.
abstract: The purpose of this study was to evaluate the effects of long-term cryopreservation on the isolated human periodontal ligament cells (PDL) and pulp tissues. In the first part of study, 10 freshly extracted teeth were selected and divided into two groups. In the cryopreserved group, the teeth were frozen for 5 years using a programmed freezer combined with a magnetic field, known as Cells Alive System "CAS". As for the control group, freshly extracted teeth were used. In each group, extracted PDL tissues were cultured and gene expression and protein concentration of collagen type I, alkaline-phosphatase (ALP) and vascular endothelial growth factor (VEGF) was compared between the two groups. In the second part, pulp tissues were obtained from 10 mature and immature third molars which were freshly extracted or cryopreserved for three months. Expression of VEGF and nerve growth factor (NGF) mRNAs and the protein concentration in the supernatant were investigated. Results indicated that long-term cryopreservation with the use of CAS freezer cannot affect the growth rate and characteristics of PDL cells. There was no significant difference in VEGF expression and VEGF and NGF protein concentration of pulp cells derived from cryopreserved teeth with immature apex and control group with mature root formation. Finally, proper PDL regeneration and appropriate apexogenesis after transplanting magnetically cryopreserved immature tooth was clinically confirmed. These findings demonstrate that teeth banking with the use of magnetic field programmed freezer can be available for future autotransplantation as a treatment modality for replacing missing teeth.
authors.affiliation: Department of Orthodontics and Craniofacial Developmental Biology, Hiroshima University, Graduate School of Biomedical Science, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Abedini
authors.forename: M
authors.initials: M
authors.lastname: Kaku
authors.forename: T
authors.initials: T
authors.lastname: Kawata
authors.forename: H
authors.initials: H
authors.lastname: Koseki
authors.forename: S
authors.initials: S
authors.lastname: Kojima
authors.forename: H
authors.initials: H
authors.lastname: Sumi
authors.forename: M
authors.initials: M
authors.lastname: Motokawa
authors.forename: T
authors.initials: T
authors.lastname: Fujita
authors.forename: J
authors.initials: J
authors.lastname: Ohtani
authors.forename: N
authors.initials: N
authors.lastname: Ohwada
authors.forename: K
authors.initials: K
authors.lastname: Tanne
mesh_terms: D000469:Alkaline Phosphatase / Q000378:metabolism; D018929:Cell Culture Techniques; D002470:Cell Survival; D015925:Cryopreservation / Q000295:instrumentation / Q000379:methods*; D003782:Dental Pulp / Q000166:cytology* / Q000378:metabolism*; D004574:Electromagnetic Fields; D004867:Equipment Design; D006801:Humans; D008280:Magnetics / Q000295:instrumentation*; D020932:Nerve Growth Factor / Q000378:metabolism; D010513:Periodontal Ligament / Q000166:cytology* / Q000378:metabolism*; D012038:Regeneration; D014070:Tooth / Q000166:cytology / Q000378:metabolism / Q000637:transplantation; D014092:Tooth Root / Q000166:cytology / Q000378:metabolism; D042461:Vascular Endothelial Growth Factor A / Q000378:metabolism
chemical_list: D042461:Vascular Endothelial Growth Factor A; D020932:Nerve Growth Factor; D000469:Alkaline Phosphatase